package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImp implements UserService {

    public final static String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //获取openid
        String openid = getOpenid(userLoginDTO);

        //判断openid是否为空，为空则登录失败
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否是新用户
        User user = userMapper.getByOpenid(openid);
        if (user == null){
            //新用户则自动完成注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user);

        }

        //返回这个用户对象
        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        //调用微信接口，获取openid
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
